package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Slf4j
@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    private WeChatPayUtil weChatPayUtil;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private AddressBookMapper addressBookMapper;

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    // 订单Mapper
    @Autowired
    private OrderMapper orderMapper;

    // 订单明细Mapper
    @Autowired
    private OrderDetailMapper orderDetailMapper;

    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional // 方法内存在多条修改数据的语句，所以要添加事务管理
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        // 处理各种业务异常
        // 地址簿为空(addressBookId)
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        // 购物车数据为空
        // 用户Id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        // 如果用户的收货地址距离商家门店超出配送范围（配送范围为5公里内），则下单失败。
        // 获取用户的收货地址
        AddressBook addr = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        String provinceName = addr.getProvinceName();
        String cityName = addr.getCityName();
        String districtName = addr.getDistrictName();
        String detailAddress = addr.getDetail();

        log.info("用户收货地址：{}", provinceName + cityName + districtName + detailAddress);


        // 向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setPayStatus(Orders.UN_PAID);
        // 订单号,使用系统时间戳
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);
        orders.setAddress(addressBook.getDetail());
        // 获取用户名称
        User user = userMapper.getUserById(userId);
        // orders.setUserName(user.getName());
        // 此处开启主键返回，方便下方明细使用
        orderMapper.insert(orders);

        // 向订单明细表插入一条或多条数据

        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            // 一条购物车数据对应一条订单详细数据
            OrderDetail orderDetail = new OrderDetail(); // 订单明细
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId()); // 设置当前明细对应的订单id
            orderDetailList.add(orderDetail);
        }
        // 批量插入n条数据
        orderDetailMapper.insertBatch(orderDetailList);

        // 清空用户购物车
        shoppingCartMapper.deleteAllByUserId(userId);

        // 封装返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderAmount(orders.getAmount())
                .orderNumber(orders.getNumber())
                .orderTime(orders.getOrderTime())
                .build();
        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getUserById(userId);

        //调用微信支付接口，生成预支付交易单
        // 绕过微信支付修改(原来未注释)
        /*JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }*/
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID");
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));
        // 为替代微信支付成功后的数据订单状态更新，多定义一个方法进行修改
        Integer OrderPaidStatus = Orders.PAID; // 支付状态，已支付
        Integer OrderStatus = Orders.TO_BE_CONFIRMED; // 订单状态，待接单

        // 发现没有将支付时间 check_out属性赋值，所以在这里更新
        LocalDateTime check_out_time = LocalDateTime.now();

        // 获取订单号码
        String orderNumber = ordersPaymentDTO.getOrderNumber();

        // 这里给前端浏览器返回来单提醒
        // 获取订单id

        // 通过订单号查询订单id
        Integer orderId = orderMapper.getOrderIdByNumber(orderNumber);

        Map map = new HashMap();
        map.put("type", 1); // 1表示来单提醒，2表示客户催单
        map.put("orderId", orderId); // 订单id
        map.put("content", "订单号：" + orderNumber);

        // 使用JSON对象把map集合转成json字符串
        String msg = JSON.toJSONString(map);
        log.info("服务器发送给前端的消息：{}", msg);

        // 发送消息
        webSocketServer.sendToAllClient(msg);

        log.info("调用updateStatus,用于替换微信支付更新数据库状态的问题");
        orderMapper.updateStatus(OrderStatus, OrderPaidStatus, check_out_time, orderNumber);

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) { // 订单号

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
        // 通过WebSocket向客户端浏览器推送消息(来单提醒)

        // 封装消息
        Map map = new HashMap();
        map.put("type", 1); // 1表示来单提醒，2表示客户催单
        map.put("orderId", ordersDB.getId()); // 订单id
        map.put("content", "订单号：" + outTradeNo);

        // 使用JSON对象把map集合转成json字符串
        String msg = JSON.toJSONString(map);

        // 发送消息
        webSocketServer.sendToAllClient(msg);
    }


    /**
     * 订单搜索
     *
     * @param ordersPageQueryDTO
     * @return
     */
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        // 设置pagehelper
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        // 封装结果
        return new PageResult(page.getTotal(), orderVOList);
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

    /**
     * 各个状态的订单数量统计
     *
     * @return
     */
    public OrderStatisticsVO statistics() {
        return orderMapper.statistics();
    }

    /**
     * 查看订单详情
     *
     * @param id -> 订单id
     * @return
     */
    public OrderVO getDetails(String id) {
        log.info("查看订单详情 id = {}", id);

        OrderVO orderVO = orderMapper.getDetails(id);
        // 根据订单id查询菜品列表
        List<OrderDetail> detailList = orderDetailMapper.getByOrderId(Long.valueOf(id));
        orderVO.setOrderDetailList(detailList);
        return orderVO;
    }

    /**
     * 接单
     *
     * @param ordersConfirmDTO
     */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        log.info("修改订单状态为已接单");
        // 手动设置status数值,前段没有传过来
        ordersConfirmDTO.setStatus(3);
        orderMapper.confirm(ordersConfirmDTO);
    }

    /**
     * 拒单
     *
     * @param ordersRejectionDTO
     */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersRejectionDTO, orders);
        // 设置订单取消时间
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.rejection(orders);
    }

    /**
     * 取消订单
     *
     * @param ordersCancelDTO
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        // 之前传递给mapper的实体是ordersCancelDTO,需要注意，
        // mybatis映射的前提是实体和表以及属性和字段都要一样才能映射
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersCancelDTO, orders);
        // 设置订单取消时间
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.cancel(orders);
    }

    /**
     * 派送订单
     *
     * @param id
     */
    public void delivery(String id) {
        Integer status = 4;
        orderMapper.delivery(id, status);
    }


    /**
     * 完成订单
     *
     * @param id
     */
    public void complete(String id) {
        Integer status = 5;
        orderMapper.complete(id, status);
    }

    /**
     * 用户端订单分页查询
     *
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult pageQuery4User(int pageNum, int pageSize, Integer status) {
        // 设置分页
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        // 分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList();

        // 查询出订单明细，并封装入OrderVO进行响应
        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();// 订单id

                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 查看订单详情
     *
     * @param id
     * @return
     */
    public OrderVO details(String id) {
        // 根据id查询订单
        Orders orders = orderMapper.getById(id);
        // 查询对应的菜品，订单明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        // 返回数据
        return orderVO;
    }

    /**
     * 用户取消订单
     *
     * @param id
     */
    public void userCancel(String id) {
        Integer status = 6;
        orderMapper.userCancel(id, status);
    }

    /**
     * 再来一单（将原订单中的商品重新加入到购物车中）
     *
     * @param id
     */
    public void oneAgain(String id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询该用户的订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(Long.valueOf(id));

        // 将订单详情对象转换为购物车对象
        // Java 8 的 Stream流
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id"); // 购物车id让sql自己实现
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 客户催单
     *
     * @param id
     */
    public void reminder(Long id) {
        // 根据id查询订单
        Orders orders = orderMapper.getById(String.valueOf(id));
        // 判断订单是否存在
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        // 使用websocket给客户端发送消息

        Map map = new HashMap();
        map.put("type", 2); // 1表示来单提醒 2表示客户催单
        map.put("orderId", id);
        map.put("content", "订单号：" + orders.getNumber());

        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }
}
